CN109425158B - Control method and control system - Google Patents
Control method and control system Download PDFInfo
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- CN109425158B CN109425158B CN201710754411.3A CN201710754411A CN109425158B CN 109425158 B CN109425158 B CN 109425158B CN 201710754411 A CN201710754411 A CN 201710754411A CN 109425158 B CN109425158 B CN 109425158B
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- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000005057 refrigeration Methods 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 abstract description 139
- 238000005299 abrasion Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 17
- 238000004378 air conditioning Methods 0.000 description 14
- 238000007791 dehumidification Methods 0.000 description 11
- 230000008859 change Effects 0.000 description 10
- 230000009471 action Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/38—Expansion means; Dispositions thereof specially adapted for reversible cycles, e.g. bidirectional expansion restrictors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/06—Damage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—Expansion valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
The invention relates to a control method, which can control the closed valve position of a valve device according to the current refrigerant flow direction or working mode, define the stroke of the valve device from the full open position to the full closed position as the total closed valve stroke, and control the valve device to operate to the first closed valve position when the refrigerant flow direction is positive; when the refrigerant flow direction is reverse, the control valve device operates to a second closing valve position, and the first closing valve position and the second closing valve position are different; therefore, the valve closing abrasion can be reduced, and the service life of the valve device is prolonged.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of refrigeration control, in particular to a control method and a control system.
[ background of the invention ]
In the thermal management system, a valve device controls the flow or on-off of a working medium according to a system command. Under different working conditions, the valve device is in the stage of closing the valve, in order to ensure that each valve closing index reaches the standard, the valve device is operated to a mechanical limit point which is closed excessively, so that the abrasion of parts such as a valve needle and a valve port is caused, and the service life of the valve device is reduced. Therefore, how to control the valve device to satisfy both the valve closing index and the wear reduction when closing the valve is a technical problem faced by those skilled in the art.
[ summary of the invention ]
The invention provides a control method and a control system, which can meet the valve closing index and simultaneously reduce the abrasion of parts such as a valve needle, a valve port and the like caused by over-closing.
A control method capable of controlling a valve device to operate to an off valve position, defining a travel of the valve device from a fully open position to a fully closed position as an off valve total travel, the off valve position including at least a first off valve position and a second off valve position, the first off valve position and the second off valve position being different, the control method comprising the steps of:
sending a valve closing command to the valve arrangement;
obtaining the current working medium flow direction;
obtaining the closed valve position of the valve device according to the current working medium flow direction;
controlling the valve device to operate to the closed valve position.
A control method capable of controlling a valve device in a refrigeration system to operate in a closed valve position, defining a stroke of the valve device from a fully open position to a fully closed position as a total closed valve stroke, the refrigeration system comprising at least two operating modes, the closed valve position comprising at least a first closed valve position and a second closed valve position, the first closed valve position and the second closed valve position being different, and the refrigerant system having a different flow direction of an operating medium through the valve device in at least two different operating modes, the control method comprising the steps of:
sending a valve closing command to the valve arrangement;
obtaining the working mode of the refrigeration system;
obtaining the closed valve position of the valve device according to the working mode;
controlling the valve device to operate to the closed valve position.
A control system capable of controlling operation of a valve device to an off valve position, defining a stroke of the valve device from a fully open position to a fully closed position as an off valve total stroke, the system comprising: the device comprises a sending module, an operation module, a receiving module and an execution module;
the sending module can be used for sending a valve closing command to the valve device;
the operation module can be used for obtaining the position of the closed valve according to the current flow direction of the working medium;
the receiving module can be used for receiving the closed valve position of the valve device;
the execution module can be configured to control the valve arrangement to operate to a closed valve position.
The control system and the control method can control the valve device to operate to the corresponding closed valve position according to the current working medium flow direction or the working mode of the refrigeration system, and the corresponding closed valve position is different when the working medium flow direction is different or the working mode of the refrigeration system is different; because the refrigeration system has different flow directions of working media, different pressures of corresponding systems and different closing valve positions corresponding to the different system pressures in different working modes, the internal leakage value of the valve device can be ensured to reach the standard when the valve is closed, the mechanical abrasion of parts such as a valve needle, a valve port and the like generated when the valve is closed every time can be reduced, and the service life of the valve device is prolonged.
[ description of the drawings ]
FIG. 1 is a schematic block diagram of an electronic expansion valve and control system;
FIG. 2 is a schematic diagram of an electronic expansion valve of FIG. 1 with the position points indicated;
FIG. 3 is a schematic view of the point of FIG. 2 in the total closed valve stroke;
FIG. 4 is a schematic flow diagram of an embodiment of a method for closing a valve of an electronic expansion valve;
FIG. 5 is a schematic flow chart diagram illustrating an exemplary method for controlling the opening of an electronic expansion valve;
FIG. 6 is a schematic flow chart diagram of another embodiment of a method of controlling an electronic expansion valve;
FIG. 7 is a schematic block diagram of a refrigeration system;
FIG. 8 is a schematic view of one embodiment of a refrigerant flow path in a cooling mode;
FIG. 9 is a schematic view of an embodiment of a refrigerant flow path in a heating mode;
FIG. 10 is a schematic view of a second embodiment of a refrigerant flow path in a cooling mode;
fig. 11 is a schematic view of a second embodiment of a refrigerant flow path in a heating mode;
FIG. 12 is a schematic view of one embodiment of a refrigerant flow path in dehumidification mode;
FIG. 13 is a schematic diagram of one embodiment of a refrigerant system control method;
FIG. 14 is a schematic block diagram of an embodiment of an electronic expansion valve control system.
[ detailed description ] embodiments
The control method and the control system provided by the embodiment of the invention can control the operation of the valve device, and the valve device can be an electronic expansion valve, a refrigerant valve or a stop valve comprising a stepping motor, which are not listed. The stop valves of the electronic expansion valve, the refrigerant valve and the application stepping motor can be applied to a vehicle-mounted air conditioning system. In the following description, an electronic expansion valve applied to a vehicle air conditioning system is used as a valve device, and in the embodiment, the electronic expansion valve is used as a working medium. Referring to fig. 1, fig. 1 is a schematic block diagram of an electronic expansion valve and control system. The control system includes: the main controller 10 and the motor controller 20, the electronic expansion valve 1 includes a motor 30, a valve body 40 and a valve assembly 50. The main controller 10 sends a control signal to the motor controller 20, the motor controller 20 sends a pulse signal to the motor 30 according to the control signal of the main controller 10 to drive the motor 30 to operate, and the motor 30 operates to drive the valve assembly 50 connected thereto to move relative to the valve body 40, thereby adjusting the position of the electronic expansion valve 1 for opening and closing the valve. The control method and the control system provided by the embodiment of the invention are applied to the motor controller 20 to control the motor 30 to act, so as to reduce the energy consumed by the motor 30 to act and reduce the energy consumption of the system. Of course, the operation of the motor 30 may be directly controlled by the main controller 10, and the motor controller 20 may be omitted.
First, the total valve-closing stroke of the electronic expansion valve 1 and the position points involved in the total valve-closing stroke will be described with reference to fig. 2 and 3. The total valve-closing stroke is a stroke of the electronic expansion valve 1 from the fully open position to the fully closed position. Fig. 2 is a schematic structural diagram of an electronic expansion valve marked with position points in fig. 1, the electronic expansion valve 1 includes a motor 30, a valve body 40 and a valve assembly 50, the motor 30 includes a coil 2 and a rotor 3, the valve assembly 50 includes a transmission element 6 and a stop element 5, a buffer spring 7 and a valve needle 8, and the electronic expansion valve 1 is formed with a valve port 9. In this embodiment, the valve port 9 is formed on the valve seat 4, and the valve seat 4 is fixedly connected with the valve body 40. The coil 2 is electrified to generate an excitation magnetic field to drive the rotor 3 to rotate, and the rotor 3 converts the rotation into the up-and-down movement of the valve needle 8 through the transmission element 6; the stop element 5 rotates with the rotor 3 and acts as an upper and lower limit for the rotor 3. The buffer spring 7 is arranged between the transmission element 6 and the valve needle 8, and the valve needle 8 is matched with the valve port 9 to realize sealing or flow regulation of the refrigerant. The electronic expansion valve further includes a first passage 11 and a second passage 12, the first passage 11 communicating with the refrigerant inlet P1, the second passage 12 communicating with the refrigerant outlet P2.
Fig. 3 is a schematic diagram of the point in fig. 2 in the total closed valve stroke. The point D is a full-open position, the point A is a full-close position, and the flow of the electronic expansion valve 1 at the point D reaches the maximum value; the point E is the target position of the electronic expansion valve 1, the position of the point E is adjusted according to a flow target command sent by the main controller 10 so as to meet different flow targets, and the point E at the target position is located between a point D at the fully-open position and a point A at the fully-closed position; the point C is a flow zero point, and when the electronic expansion valve 1 is positioned at the point C, the flow channel just starts to be conducted or the theoretical value of the flow is zero; point B is the first closed valve position of the electronic expansion valve 1, the first closed valve position B is between the point a of the fully closed position and the point C of the flow zero point, and is close to the point a of the fully closed position but does not reach the point a of the fully closed position, when the current refrigerant flow direction is the forward direction, i.e. the refrigerant flows in from the refrigerant inlet P1, the refrigerant outlet P2 flows out, at this time, the pressure of the refrigerant in the first passage 11 communicated with the refrigerant inlet P1 is greater than the pressure of the refrigerant in the second passage 12 communicated with the refrigerant outlet P2, at this time, the valve needle 8 receives the valve closing force, and controls the electronic expansion valve 1 to operate to the point B of the first closed valve position. In this embodiment, the stroke between the point B of the first closing valve position and the point D of the full opening position is 90% to 99% of the total stroke of the closing valve, when the electronic expansion valve 1 runs to the point B of the first closing valve position, the valve closing index can be satisfied, and meanwhile, the friction force exerted on the valve needle 8, the valve port 9 and other components is small; when the refrigerant flow direction is reverse, i.e. the refrigerant flows in from the refrigerant outlet P2, the refrigerant inlet P1 flows out, and the refrigerant pressure of the first passage 11 communicating with the refrigerant inlet P1 is lower than the refrigerant pressure of the second passage 12 communicating with the refrigerant outlet P2, and the valve needle 8 receives the valve opening force, the electronic expansion valve 1 is controlled to operate to the second closing valve position a, which is the fully closing position, so as to ensure the sealing performance. The second closing valve position a point is the position of the electronic expansion valve 1 after initialization is completed, and is also a full-closed mechanical limit point of the electronic expansion valve 1, and when the electronic expansion valve 1 runs to the second closing valve position a point, the closing index can be met.
The first closed valve position B is mainly affected by the spring constant of the damper spring 7 of the electronic expansion valve 1, and the smaller the spring constant of the damper spring 7 is, the larger the stroke range selectable between the first closed valve position B and the full open position D is. The travel between the first closed valve position B point and the full open position D point is different for different electronic expansion valves. For example, when the elastic coefficient of the buffer spring 7 is 3N/mm, the selectable stroke range between the first closed valve position B point and the full-open position D point is 90-99% of the total closed valve stroke; when the elastic coefficient of the buffer spring 7 is 5N/mm, the selectable stroke range between the first closed valve position B point and the full-open position D point is 92-99% of the total stroke of the closed valve; when the elastic coefficient of the buffer spring 7 is 7N/mm, the selectable stroke range between the first closed valve position B point and the full-open position D point is 95-99% of the total stroke of the closed valve; when the elastic coefficient of the buffer spring 7 is 10N/mm, the selectable stroke range between the first closed valve position B point and the full-open position D point is 96-99% of the total closed valve stroke. The embodiment is only described by selecting one of the cases, and of course, other spring constant buffer springs 7 can be used to control the valve position, which is not listed here.
The embodiment of a control method for closing a valve of an electronic expansion valve comprises the following steps:
referring to fig. 4, fig. 4 is a schematic flow diagram of an embodiment of a method for controlling a shut-off valve of an electronic expansion valve.
The method for controlling the closing valve of the electronic expansion valve 1 provided by the embodiment comprises the following steps:
s101, sending a valve closing command to the electronic expansion valve 1;
in order to enable the electronic expansion valve 1 to operate normally, the electronic expansion valve 1 needs to be initialized when being opened for the first time, so that the working accuracy of the electronic expansion valve 1 can be ensured.
It should be noted that the initialization operation of powering on the electronic expansion valve 1 is only performed when the electronic expansion valve 1 is first started or after troubleshooting, and at this time, the electronic expansion valve 1 is forcibly operated to the second closed valve position a.
S102, obtaining the current refrigerant flow direction;
it can be understood that the flow direction of the refrigerant is changed at any time when the air conditioner of the vehicle is operated. The direction of the refrigerant flow directly affects the direction of the refrigerant pressure received by the electronic expansion valve 1, and thus the closed valve position of the electronic expansion valve 1.
When the refrigerant flow direction is a forward direction, the pressure of the refrigerant on the electronic expansion valve 1 is consistent with the valve closing direction of the electronic expansion valve 1, and the pressure of the refrigerant plays a role in promoting the valve closing action of the electronic expansion valve 1; when the refrigerant flow direction is reverse, the pressure of the refrigerant on the electronic expansion valve 1 is opposite to the closing direction of the electronic expansion valve 1, and the refrigerant pressure acts as a barrier to the closing operation of the electronic expansion valve 1.
S103, obtaining the closed valve position of the electronic expansion valve 1 according to the current refrigerant flow direction;
the closed valve position of the electronic expansion valve 1 in this embodiment is mainly affected by the flow direction of the refrigerant, and after the electronic expansion valve is molded, the elastic coefficient of the buffer spring 7 is determined at the same time, and the positions of the first closed valve position B and the fully closed position a are also determined. Therefore, in actual conditions, the closed valve position of the same electronic expansion valve 1 is mainly affected by the refrigerant flow direction, the refrigerant flow direction is different, and the closed valve position of the electronic expansion valve 1 is also different. When the current refrigerant flow direction is a forward direction, the refrigerant pressure promotes the closing of the electronic expansion valve 1, and the closing position of the electronic expansion valve 1 is a first closing position B point, namely, a position with a stroke of 90-99% of the total closing stroke between the point D of a full-opening position and the point D of the first closing position; when the current refrigerant flow direction is reverse, the refrigerant pressure acts as a barrier to the closing of the electronic expansion valve 1, and at this time, in order to meet the closing index, the closing position of the electronic expansion valve 1 is the second closing position a point, that is, the fully-closed position a point. The valve closing position is obtained in real time according to the actual refrigerant flow direction, various valve closing indexes can reach the standard when the valve is closed every time, meanwhile, the abrasion of parts such as a valve needle and a valve port caused by over-closing when the valve is closed every time is reduced, and the service life and the control precision of the electronic expansion valve are favorably improved.
S104, controlling the electronic expansion valve 1 to operate to the closed valve position;
when the electronic expansion valve 1 is normally operated, the electronic expansion valve 1 needs to stop at a certain target position E point in the total valve closing stroke which meets the corresponding flow target according to the actual flow target, so the valve closing action of the electronic expansion valve 1 is started from the target position E point. When the electronic expansion valve 1 receives a valve closing command and the refrigerant flow direction is in a forward direction, the motor controller 20 controls the electronic expansion valve 1 to operate to a first valve closing position B, and valve closing is completed; when the electronic expansion valve 1 receives a valve closing command and the refrigerant flow direction is reverse, the motor controller 20 controls the electronic expansion valve 1 to operate to the second valve closing position a, and the valve closing action is completed. After the valve closing action is completed and before a new valve opening command is not received, the main controller 10 monitors the change condition of the refrigerant flow direction, and if the refrigerant flow direction is not changed, the electronic expansion valve 1 is kept at the original valve closing position; if the refrigerant flow direction changes from the forward direction to the reverse direction, the electronic expansion valve 1 is adjusted from the first closed valve position B point to the second closed valve position A point; if the refrigerant flow direction changes from the reverse direction to the forward direction, the electronic expansion valve 1 is adjusted from the second closing valve position a point to the first closing valve position B point.
An embodiment of a valve opening control method of an electronic expansion valve comprises the following steps:
referring to fig. 5, fig. 5 is a flowchart illustrating an embodiment of a method for controlling an opening of an electronic expansion valve.
The method for controlling the opening of the electronic expansion valve 1 provided by the embodiment comprises the following steps:
s201, sending a valve opening command to the electronic expansion valve 1;
it is understood that the opening of the electronic expansion valve 1 described here is not the initial opening, but is an opening after closing in accordance with the closing operation described above.
S202, obtaining a current refrigerant flow direction and flow target;
it should be noted here that, when the automotive air conditioning system is running, after the valve closing operation is completed, the last closed valve position of the electronic expansion valve 1 can be directly obtained according to the current refrigerant flow direction, and the closed valve position is also the open valve starting position of the electronic expansion valve 1; according to the flow target command sent by the main controller 10, the position of the target position E corresponding to the flow target is obtained, and the target position E is the valve opening end position of the electronic expansion valve 1.
S203, obtaining a valve opening starting position and a valve opening end position of the electronic expansion valve 1 according to the current refrigerant flow direction and flow target;
when the current refrigerant flow direction is the forward direction, the open valve starting position of the electronic expansion valve 1 is a first closed valve position B; when the current refrigerant flow direction is reverse, the open valve starting position of the electronic expansion valve 1 is a second closed valve position A; and obtaining the position of a target position E point corresponding to the flow target according to the actual flow target, wherein the position of the target position E point is the valve opening end point position.
S204, controlling the electronic expansion valve 1 to move from a valve opening starting position to a valve opening end position;
after the valve opening starting position and the valve opening end position of the electronic expansion valve 1 are determined, the main controller 10 sends a control command to the motor controller 20, and the motor 30 is controlled to drive the valve assembly 50 to move, so that the valve opening operation is completed.
Another embodiment of an electronic expansion valve control method:
referring to fig. 6, fig. 6 is a schematic flow diagram of another embodiment of a method of controlling an electronic expansion valve.
Firstly, starting an automobile air conditioning system;
s301, electrifying the electronic expansion valve 1 and completing initialization;
here, the initialization operation of the electronic expansion valve 1 is generally performed only during the first start of the electronic expansion valve 1 or the start after the failure removal, and the flow rate control accuracy of the electronic expansion valve 1 is ensured by powering on the electronic expansion valve 1 and completing the initialization. At this time, the electronic expansion valve is controlled to operate to the full-closed position A point.
S302, the electronic expansion valve 1 receives a valve opening command for operating to a target position E point; sending a valve opening command and a flow target to the electronic expansion valve 1 by the main controller 10, and sending corresponding information of a valve opening starting position and a valve opening end position to the electronic expansion valve 1, wherein the valve opening starting position is a fully-closed position A point, and the valve opening end position is a target position E point meeting the flow target;
here, the target position E point is located between the fully-open position D point and the fully-closed position a point, is a target position variable, changes in real time in accordance with the flow rate target command, and may be the same or different for each valve opening, and is adjusted as necessary.
S303, operating the electronic expansion valve 1 to a target position E point;
and controlling the electronic expansion valve 1 to operate from the point A of the full-closed position to the point E of the target position, and starting the stable operation of the air conditioning system.
S304, the electronic expansion valve 1 receives a valve closing command and refrigerant flow direction information;
after the air conditioner is operated for a certain period of time, the main controller 10 sends a valve closing command and current refrigerant flow direction information to the electronic expansion valve 1.
S305, obtaining the current refrigerant flow direction;
the current refrigerant flow direction is obtained by the main controller 10, and the closed valve position of the electronic expansion valve 1 is obtained according to the current refrigerant flow direction. When the current refrigerant flow direction is the forward direction, the valve closing position of the electronic expansion valve 1 is a first valve closing position B point; when the refrigerant flow direction is reverse, the valve closing position of the electronic expansion valve 1 is the second valve closing position a.
S306, when the flow direction of the refrigerant is in the positive direction, the electronic expansion valve 1 operates to a first closed valve position B;
when the current refrigerant flow direction is the forward direction, the valve closing position of the electronic expansion valve 1 is a first valve closing position B point, the stroke between the first valve closing position B point and a full-opening position D point is 90% -99% of the total valve closing stroke, and the electronic expansion valve 1 is controlled to operate to the first valve closing position B point.
S307, when the flow direction of the refrigerant is reverse, the electronic expansion valve 1 operates to a second closed valve position A point;
when the current refrigerant flow direction is reverse, the valve closing position of the electronic expansion valve 1 is a second valve closing position a point, the second valve closing position a point is a full closing position in the valve closing total stroke, and the electronic expansion valve 1 is controlled to operate to the second valve closing position a point.
S308, completing closing of the electronic expansion valve 1;
the electronic expansion valve 1 runs to the corresponding valve closing position to complete the valve closing action.
S309, monitoring a valve opening command and a refrigerant flow direction;
after the valve closing operation is completed, the motor controller 20 receives the valve opening command and the refrigerant flow direction information from the main controller 10 and controls the electronic expansion valve to open. If the main controller 10 monitors that the refrigerant flow direction is not changed before receiving a new valve opening command, and returns to step S302 to sequentially repeat the valve opening and closing operation after receiving the new valve opening command; if the main controller 10 monitors that the refrigerant flow direction is changed before receiving the valve opening command, refer to step S310.
S310, monitoring that the flow direction of the refrigerant is changed;
the main controller 10 monitors the change of the refrigerant flow direction and sends the change to the motor controller 20, and controls the electronic expansion valve 1 to adjust the closed valve position.
S311, changing the flow direction of the refrigerant from the reverse direction to the forward direction, and adjusting the electronic expansion valve 1 to operate to a first closed valve position B;
when the main controller 10 monitors that the refrigerant flow direction changes from the reverse direction to the forward direction, the motor controller 20 controls the electronic expansion valve 1 to adjust the closed valve position from the second closed valve position a point to the first closed valve position B point.
S312, changing the flow direction of the refrigerant from the forward direction to the reverse direction, and adjusting the electronic expansion valve 1 to operate to a second closed valve position A;
when the main controller 10 monitors that the refrigerant flow direction changes from the forward direction to the reverse direction, the motor controller 20 controls the electronic expansion valve 1 to adjust the closed valve position from the first closed valve position B point to the second closed valve position a point.
S308, completing closing of the electronic expansion valve 1;
and adjusting the position of a valve to be closed in real time according to the flow direction change of the refrigerant, finishing the valve closing action, continuously monitoring a valve opening command and the flow direction change of the refrigerant, and repeating the steps to control the action of the valve to be opened and closed of the electronic expansion valve 1.
Of course, the off valve position may also be derived depending on the operating mode of the refrigerant system.
Referring to fig. 7, fig. 7 is a schematic block diagram of a refrigeration system. Taking an air-conditioning refrigeration system as an example, the air-conditioning refrigeration system mainly comprises four parts: compressor a1, outdoor heat exchanger a2, valve arrangement A3, and indoor heat exchanger a4, where valve arrangement A3 is an electronic expansion valve.
Referring to fig. 8, fig. 8 is a schematic diagram of an embodiment of a refrigerant flow path in a cooling mode, in which a gas refrigerant is compressed by a compressor a1 to change from a low-temperature low-pressure gas to a high-temperature high-pressure gas, and enters an outdoor heat exchanger a2, an outdoor heat exchanger a2 serves as a condenser, the refrigerant is condensed and liquefied in the outdoor heat exchanger a2 to release heat into a liquid, the liquid is decompressed by a valve device A3 and enters an indoor heat exchanger a4, and an indoor heat exchanger a4 serves as an evaporator, the refrigerant is evaporated, gasified, absorbed heat in the indoor heat exchanger a4 to change into a low-temperature low-pressure gas, and returns to the compressor a1 to perform the next cycle. In this process, the outdoor heat exchanger a2 releases heat to the outside, and the indoor heat exchanger a4 absorbs heat of indoor air, thereby achieving the purpose of reducing indoor temperature. At this time, the refrigerant flows from the outdoor heat exchanger a2 to the valve device A3, and the refrigerant flow is defined as a forward direction, and then, in the cooling mode, the refrigerant system control valve device is operated to the first off position after receiving the off command. The stroke of the valve device a3 from the fully open position to the fully closed position is defined as the total closed valve stroke, and the first closed valve position is defined as a position between the fully open position and the fully open position, wherein the stroke is 90% to 99% of the total closed valve stroke.
Referring to fig. 9, fig. 9 is a schematic view of an embodiment of a refrigerant flow path in a heating mode, in which a gas refrigerant is compressed by a compressor a1 to change from a low-temperature low-pressure gas into a high-temperature high-pressure gas, and enters an indoor heat exchanger a4, an indoor heat exchanger a4 serves as a condenser, the refrigerant is condensed and liquefied in the indoor heat exchanger a4 to release heat into a liquid, the liquid is decompressed by a valve device A3 and enters an outdoor heat exchanger a2, an outdoor heat exchanger a2 serves as an evaporator, and the refrigerant is evaporated, gasified, absorbed heat in the outdoor heat exchanger a2 to change into a low-temperature low-pressure gas, and returns to the compressor a1 to perform the next cycle. In the process, the indoor heat exchanger a4 releases heat to the indoor, and the outdoor heat exchanger a2 absorbs heat of outdoor air, thereby achieving the purpose of increasing indoor temperature. At this time, the refrigerant flows from the valve device A3 to the outdoor heat exchanger a2, and the refrigerant flow direction is reversed in the heating mode, and the refrigerant system control valve device is operated to the second off position after receiving the off command, where the second off position is the fully off position of the total off stroke.
In this embodiment, the flow directions of the refrigerant in the cooling mode and the heating mode are different, and the corresponding off-valve positions are also different, and in an actual working condition, the cooling system further includes other working modes except the cooling mode and the heating mode, and a second embodiment of the present invention is described below with reference to the drawings.
Referring to fig. 10, fig. 10 is a schematic view of a second embodiment of a refrigerant flow path in a cooling mode, in which a solid line portion indicates the refrigerant flow path and an arrow direction indicates a flow direction of the refrigerant. In the cooling mode, the refrigerant flows out of the compressor a1, enters the air conditioning box A6, enters the outdoor heat exchanger a2 through the air conditioning box A6 to exchange heat, enters the air conditioning box A6 through the valve device A3, corresponds to an evaporator in the case where the air conditioning box A6, flows out of the air conditioning box A6, returns to the compressor a1 through the gas-liquid separator A5, and completes one operation cycle. The refrigerant flow from the outdoor heat exchanger a2 to valve arrangement A3 is specified to be positive, and in the cooling mode, the refrigerant system receives a valve closing command and controls valve arrangement A3 to operate to the corresponding first valve closing position.
Referring to fig. 11, fig. 11 is a schematic view of a second embodiment of a refrigerant flow path in a heating mode, in which a solid line portion indicates the refrigerant flow path and an arrow direction indicates a flow direction of the refrigerant. In the heating mode, refrigerant flows out of the compressor A1 and enters the air conditioning box A6, and after the whole heat exchange process of condensation and evaporation is completed, the refrigerant directly passes through the gas-liquid separator A5 through the valve device A3 and returns to the compressor, and the work cycle is completed. In the heating mode, refrigerant flows from valve arrangement A3 to outdoor heat exchanger a2, opposite to the refrigerant flow in the cooling mode, and therefore, after the refrigerant system receives a valve-closing command, control valve arrangement A3 is operated to the second valve-closing position.
Referring to fig. 12, fig. 12 is a schematic view of an embodiment of a refrigerant flow path in a dehumidification mode, in which a solid line portion indicates the refrigerant flow path and an arrow direction indicates a flow direction of the refrigerant. In the dehumidification mode, the refrigerant flows in a similar direction to that in the refrigeration mode, but after passing through the valve device A3, may flow to the gas-liquid separator a5 via the outdoor heat exchanger a2, or may flow directly to the gas-liquid separator a5, completing the operation cycle. In the dehumidification mode, the refrigerant flow is also directed from valve set A3 to outdoor heat exchanger a2, so the off-valve position in the dehumidification mode is the same as the off-valve position in the refrigeration mode, and after the refrigeration system receives an off-valve command, valve set A3 is controlled to operate to the first off-valve position.
Under actual working conditions, the refrigerant flow direction in the refrigeration mode and the dehumidification mode of the refrigeration system is the same. In the design stage of the refrigeration system, the refrigerant flow direction in the refrigeration mode can be designed to be a reverse flow process from the indoor heat exchanger a4 to the valve device A3 according to actual needs, so that the refrigerant flow direction in the refrigeration mode is reverse, the refrigerant flow direction in the heating mode is forward, and the refrigerant flow direction in the dehumidification mode is reverse; when the refrigerant flowing direction is positive, the valve closing position of the valve device is a first valve closing position; when the flow direction of the refrigerant is reversed, the valve closing position of the valve device is the second valve closing position.
Of course, the refrigeration system also includes other operation modes, and the cooling mode, the heating mode and the dehumidification mode also include several different levels of mode conditions, such as a first cooling mode, a second cooling mode, a first heating mode, a second heating mode, a single dehumidification mode, a cooling dehumidification mode, and the like, which are not listed here. The flow direction of the refrigerant in the different operation modes is determined by the design of the refrigeration system itself. After the refrigeration system is designed and molded, the flow directions of the corresponding refrigerants in different working modes are determined, that is, for the same refrigeration system, the same working mode only corresponds to the same refrigerant flow direction, the same refrigerant flow direction only corresponds to one closed valve position, the working mode is determined, the refrigerant flow direction is determined, and the closed valve position is also determined. The closed valve position can be directly obtained according to the current working mode of the refrigeration system, and the action of the switch valve of the valve device is controlled or the closed valve position is adjusted according to the switching of the working mode.
Referring to fig. 13, fig. 13 is a schematic diagram of one embodiment of a refrigeration system control method. In general, the operation modes of the refrigeration system are different, the flow direction of the refrigerant is different, and the operation cycle direction of the system is different. The operation modes of the refrigeration system mainly include a refrigeration mode, a heating mode, a dehumidification mode, and the like. After the design and the design of the refrigeration system are established, the refrigerant flow direction under the same working mode is the same, and the valve closing position is also the same.
S401, sending a valve closing command to a valve device;
the main controller 10 sends a valve closing command to the valve device to control the electronic expansion valve to start.
S402, obtaining the working mode of the refrigerating system;
after the main controller 10 sends a valve closing command, information about the current operation mode of the refrigeration system is obtained first. The operation mode is different, the refrigerant flow direction is different, and the valve closing position is also different.
S403, obtaining the closed valve position of the valve device according to the working mode of the refrigeration system;
the main controller 10 obtains the off valve position in the corresponding operation mode according to the current operation mode of the refrigeration system.
S404, controlling the valve device to operate to a closed valve position;
and after controlling the valve device of the refrigeration system to operate to the corresponding valve closing position, finishing the valve closing action.
The control method of the refrigeration system is similar to that of the electronic expansion valve, except that the determination of the flow direction of the refrigerant is changed into the determination of the operation mode of the refrigeration system, so that the closed valve position is obtained. The specific control method is similar to the above, and is not described herein again.
Based on the control method provided by the embodiment, the invention also provides a control system.
Referring to fig. 14, fig. 14 is a schematic block diagram of an embodiment of an electronic expansion valve control system.
The control system of the electronic expansion valve provided by the embodiment comprises: a sending module 100, an operation module 200, a receiving module 300 and an execution module 400;
a transmitting module 100, capable of transmitting a control signal;
the operation module 200 can be used for obtaining information such as a valve closing position, a valve opening starting position or a valve opening end position according to the current refrigerant flow direction, the working mode of the refrigeration system and a flow target;
a receiving module 300 capable of receiving information such as a valve closing position, a valve opening starting position, and a valve opening end position;
and the execution module 400 can be used for executing the control command to control the electronic expansion valve 1 to operate to the corresponding position. In the control system of the present embodiment, after the sending module 100 sends the control signal to the electronic expansion valve 1, the computing module 200 obtains the corresponding information of the off-valve position, the valve-opening starting position, or the valve-opening end position, the receiving module 300 receives the corresponding control command and the information of the off-valve position, the valve-opening starting position, and the valve-opening end position, and the executing module 400 controls the electronic expansion valve 1 to operate to the corresponding off-valve position, the valve-opening starting position, or the valve-opening end position according to the related information received by the receiving module 300.
In the control method and the control system provided by the embodiment, when the air conditioning system operates, the stroke of the electronic expansion valve from the point D of the full-open position to the point a of the full-close position is the total closed valve stroke. When a valve closing command is received, the current refrigerant flow direction is obtained, when the refrigerant flow direction is in the forward direction, the valve closing position of the electronic expansion valve is a first valve closing position B point, and the stroke between the first valve closing position B point and a full-opening position D point is 90-99% of the total valve closing stroke; when the flow direction of the refrigerant is reverse, the closing position of the electronic expansion valve is a second closing valve position A point, the second closing valve position A point is a full closing position of a total closing valve stroke, and the electronic expansion valve is controlled to operate to the corresponding closing valve position every time, so that the electronic expansion valve can meet the closing index when closing the valve, the mechanical abrasion of parts such as a valve needle and a valve port can be reduced to the maximum extent, and the flow control precision, the working efficiency and the service life of the electronic expansion valve can be improved.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A control method capable of controlling a valve device to operate to an off valve position, defining a travel of the valve device from a fully open position to a fully closed position as an off valve total travel, the off valve position including at least a first off valve position and a second off valve position, the first off valve position and the second off valve position being different, the control method comprising the steps of:
sending a valve closing command to the valve arrangement;
obtaining the current working medium flow direction;
obtaining the closed valve position of the valve device according to the current working medium flow direction;
controlling the valve arrangement to operate to the off-valve position;
when the current working medium flow direction is a positive direction, the control method can control the valve device to operate to a first closed valve position, and the first closed valve position does not reach but is close to the full closed position;
when the current working medium flow direction is reverse, the control method can control the valve device to operate to a second valve closing position, and the second valve closing position is the full valve closing position.
2. The control method of claim 1, wherein the valve device is an electronic expansion valve and the travel between the first closed valve position and the fully open position is between 90% and 99% of the total travel of the closed valve.
3. The control method according to claim 2, characterized by further comprising the steps of:
sending a valve opening command to the valve device;
obtaining the current working medium flow direction and flow target;
obtaining a valve opening starting position and a valve opening end position of the valve device according to the current working medium flow direction and the flow target;
controlling the valve device to move from the valve opening starting position to the valve opening end position;
the full-open position of the valve device is the position where the flow of the valve device is maximum, the full-close position of the valve device is the full-close mechanical limiting point of the valve device, and the target position corresponding to the flow target is the position where the flow meets the flow target requirement.
4. The control method of claim 3, wherein the current working medium flow direction is a forward direction, and the open valve start position is the first closed valve position;
the current working medium flow direction is reverse, and the open valve starting position is the second close valve position;
the valve opening end position is a target position corresponding to the flow target.
5. The control method according to claim 1, wherein the valve device is an electronic expansion valve including a motor, a valve body, and a valve assembly, the motor including a coil and a rotor, the valve assembly including a transmission element, a buffer spring, and a valve needle, the electronic expansion valve being formed with a valve port, the rotor converting rotation into up-and-down movement of the valve needle by the transmission element; the buffer spring is arranged between the transmission element and the valve needle, and the smaller the elastic coefficient of the buffer spring is, the larger the selectable travel range between the first closed valve position and the full-open position is.
6. A control method capable of controlling a valve device in a refrigeration system to operate to an off-valve position, defining a travel of the valve device from a fully-open position to a fully-closed position as an off-valve total travel, the refrigeration system including at least two operating modes, namely a cooling mode and a heating mode, the off-valve position including at least a first off-valve position and a second off-valve position, the first off-valve position and the second off-valve position being different, and a flow direction of a working medium of the refrigeration system through the valve device being different in at least two different operating modes, the control method comprising the steps of:
sending a valve closing command to the valve arrangement;
obtaining the working mode of the refrigeration system;
obtaining the closed valve position of the valve device according to the working mode and the flow direction of the working medium;
controlling the valve arrangement to operate to the off-valve position;
in the refrigeration system, the flow direction of the working medium in the refrigeration mode is opposite to the flow direction of the working medium in the heating mode, the off-valve position in the refrigeration mode is different from the off-valve position in the heating mode, the flow direction of the working medium in the refrigeration mode is a forward direction, and the off-valve position in the refrigeration mode is a first off-valve position; the flow direction of the working medium in the heating mode is reverse, the valve closing position in the heating mode is a second valve closing position, and the second valve closing position is the fully-closed position; in the refrigeration system, the flow direction of the working medium in the refrigeration mode is reverse, the valve closing position in the refrigeration mode is a second valve closing position, and the second valve closing position is the fully-closed position; the flow direction of the working medium in the heating mode is positive, and the valve closing position in the heating mode is a first valve closing position; and controlling the valve device to run to the corresponding closed valve position according to the working mode, wherein the first closed valve position does not reach but is close to the full-closed position.
7. The control method of claim 6, wherein a stroke between the first closed valve position and the fully open position is 90% to 99% of a total stroke of the closed valve.
8. A control system capable of controlling operation of a valve device to an off valve position, defining a stroke of the valve device from a fully open position to a fully closed position as an off valve total stroke, the system comprising: the device comprises a sending module, an operation module, a receiving module and an execution module;
the sending module can be used for sending a valve closing command to the valve device;
the operation module can be used for obtaining the position of the closed valve according to the current flow direction of the working medium;
the receiving module can be used for receiving the closed valve position of the valve device;
the execution module is capable of controlling the valve device to operate to a closed valve position; when the current working medium flow direction is positive, the execution module can control the valve device to operate to a first closed valve position, and the first closed valve position does not reach but is close to the full closed position; when the current working medium flow direction is reverse, the execution module can control the valve device to operate to a second valve closing position, and the second valve closing position is the full valve closing position.
9. The control system of claim 8, wherein: the valve device is an electronic expansion valve, and the stroke between the first valve closing position and the full opening position is 90-99% of the total stroke of the valve closing.
10. The control system of claim 9, wherein:
the sending module can be further used for sending a valve opening command to the valve device;
the operation module can be further used for obtaining a valve opening starting point position and a valve opening end point position according to the current working medium flow direction and flow target;
the receiving module may be further configured to receive information of the valve opening start position and the valve opening end position;
the execution module may be further configured to control the valve device to move from the valve opening start position to the valve opening end position.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710754411.3A CN109425158B (en) | 2017-08-29 | 2017-08-29 | Control method and control system |
| PCT/CN2018/099334 WO2019042100A1 (en) | 2017-08-29 | 2018-08-08 | Control method and control system |
| EP18850096.1A EP3677859B1 (en) | 2017-08-29 | 2018-08-08 | Control method and control system |
| US16/642,881 US11313601B2 (en) | 2017-08-29 | 2018-08-08 | System and method for controlling an expansion valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710754411.3A CN109425158B (en) | 2017-08-29 | 2017-08-29 | Control method and control system |
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| Publication Number | Publication Date |
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| CN109425158A CN109425158A (en) | 2019-03-05 |
| CN109425158B true CN109425158B (en) | 2021-09-07 |
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| CN201710754411.3A Active CN109425158B (en) | 2017-08-29 | 2017-08-29 | Control method and control system |
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| Country | Link |
|---|---|
| US (1) | US11313601B2 (en) |
| EP (1) | EP3677859B1 (en) |
| CN (1) | CN109425158B (en) |
| WO (1) | WO2019042100A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3712472A4 (en) * | 2017-11-13 | 2021-08-04 | Emerson Climate Technologies (Suzhou) Co., Ltd. | Electronic expansion valve |
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Also Published As
| Publication number | Publication date |
|---|---|
| US11313601B2 (en) | 2022-04-26 |
| EP3677859A1 (en) | 2020-07-08 |
| EP3677859A4 (en) | 2021-05-19 |
| US20200208893A1 (en) | 2020-07-02 |
| CN109425158A (en) | 2019-03-05 |
| WO2019042100A1 (en) | 2019-03-07 |
| EP3677859B1 (en) | 2022-10-12 |
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